Fire arch for furnaces



E. E. FROZETH ET AL.

FIRE ARCH FOR FURNACES Filed May 24 1921 2 Sheets-Sheet 1 gwuento'mTERRY BLIXT ERNST EMIL FRuzETH Apr. 17, 1923. 1,452,295

. E. E. FROZETH ET AL FIRE ARCH FOR FURNACES Filed May 24 1921 2Sheets-Sheet 2 8 :E lg 3 I Z8 Z8 IQ- ig- TERRY BLIXT ERNST EMIL FROZETHPatented Apr. 17, 1123..

are er mnsr MIL FRO ZETH AND TERRY BLIXT, 0]! MINNEAPOLIS, MINNESOTA.

FIRE ARCH FOR FURNACES.

Application filed May 24, 1921. Serial No. 472,261.

To all whom it may concern:

Be it known that we, ERNST E. Fnozn'rn and TERRY BLIXT, citizens of theUnited States, residing at Minneapolis, in the county of Hennepin andState of Minnesota, have invented certain new and useful Improvements inFire Arches for Furnaces, of which the following is a specification.

This invention relates to fire arches for furnaces and boilers and themain object is to provide a highly efficient and practical constructionof fire arch and means for suspending the same in a furnace where aparticularly strong arch is deslred or where a high degree of heat isdeveloped. Further objects will be disclosed in the course of thefollowing specification and are 1 llustrated in the accompanyingdrawings, in which:

Fig. 1 is a top plan view of the arch 1n place in a furnace, the top ofthe furnace and many parts of the arch suspending ele-- ments beingremoved.

Fig. 2 is a transverse sectional view of the furnace arch, as seensubstantially on the line 2-2 in Fig. 1.

Fig. 3 is a section of the arch as seen substantially on the line 3-3 inFig. 1.

Fig. 4 is a detail side view of one of the wedge shaped blocks.

Fig. 5 is an end view of one of the wedge shaped blocks.

Fig. 6 is anenlarged detail section on the line 66 in Fig. 3. I

Fig. 7 is a detail view illustrating a modification of one of the fireblocks.

Referring to the drawings by reference characters, 10 designates thefront wall of a furnace having side walls 11 and a curtain wall 12, allsuitably constructed of common fire brick. The arch as hereinafterdescribed, is almost entirely sustained between the walls 10 and 11 bybeing suspended from two transverse girders 13, 14 which are preferablymade of channel iron and have their ends imbedded in the side walls 11.Supported 'on the lower flanges of the channel girders 13 and 14 is aseries of suspension beams, each consisting of two angle irons 15 heldtogether but in slightly spaced relation by suitable clips 16. Hangers17 are suspended between the angle irons 15 of each pair b pins 18,their lower ends being secured y pins 19 in slots 20 of tapered heads 21of the main arch blocks 22.

An angle iron 23 runs parallel to the channel girder 14 and is boltedthereto by bolts 24, being first spaced therefrom by spacers 25.-Intermediate this channel iron and angle iron are positioned hangers 26which are similar to the hangers 17, but which support a series of.corner hanger blocks 27 (see Figs. 3 and 6). These blocks 27 areangularly tongued and grooved against each other as at 28 so as toprevent the passage of flames directly up between them to the ironbeams. These blocks are also formed with a wide shoulder 29 (see Fig. 3)adapted to support a part of the weight of the curtain wall 12, thebalance of such weight being carried by the horizontal flange of theangle iron 23.

The blocks 22, 27 are enlarged at their lower ends so as to present thecontinuous fire surface of the arch, but their main body portions areupwardly tapered so as to receive between them a numberof what may betermed wedge blocks 8 and 30. .The blocks 8 are longer at their lowerends than at their upper ends (see Fig. 4) so as to conform with therecesses between the blocks 22, but, as'the blocks 30 follow each otherin'a row their ends may be square cut, thereby making the arch a solidand firm construction. It will be readily understood that the blocks 8and 30 being wedge shaped will have a tendency to tighten the arch, andthis condition will also have the effect of distributing their pressureequally on all parts of the suspension blocks with which they come incontact and not on a few particular places as has been quite universallycustomary heretofore. To allow for the expansion and contraction of thearch from heat We find it desirable to provide a composition packing tobe inserted between the blocks 8, 30 and 22, 27. Such a composition" ispreferably made of asbestos. gannister and clay, or some similarmaterial.

It will be noted that the blocks 8 and 30 are considerably shorter thanthe suspension blocks, and also, that the suspension blocks are providedwith shoulders on which rest the capping blocks or plates 9, the objectbeing to create an air space such as 31. To provide for a slightventilation under the plates 9 so as to prevent the accumulation of deadair, a few of the blocks 9 may have ventilating holes 32 (see Fig.

1),-or, may preferably have a corner broken off (see Fig. 7 as such ismore easily provided.

From the foregoing it is believed that our invention will be understoodand its advantages and merits realized by all those familiar with thepresent state of the art. We, however, do not desire to limit ourselvesto the particular forms, arrangements and constructions as illustratedand described, and in the construction and installation of the devicemay see fit to embody a number of modifications, provided, however thatsuch modifications come within the spirit and scope of the appendedclaims.

Having now therefore fully shown and described our invention, what weclaim to be new and desire to protect by Letters Patent is: 7

1. A fire arch of the classdescribed consisting of a number ofsuspension blocks, the same being widest at their lower ends andarranged so as toform with their lower ends the entire underside of thearch, means for hanging the suspension blocks in a boiler or furnace,and a number of downwardly tapered wedge blocks adapted to be insertedand substantially fill the space in between the suspension blocks abovesaid lower ends.

2. A fire arch of the class described consisting of a number ofsuspension blocks each tapering upwardv on all sides from its lower end,downwardly tapering wedge blocks adapted to substantially fill in thespaces between the body portions of the suspension blocks, and means forhanging the suspension blocks in a furnace so as to permit their lowerends to compose the en tire underside of the arch.

3. A fire arch of the class described consisting of a number of upwardlytapered suspension blocks hung in checked arrange ment so-that theirlower ends will compose the underside of the arch, downwardly taperedwedge blocks arranged to fill the spaces between said suspenslon blocks,some of said wedge blocks having inclined end faces so as to closely fitagainst the sides of adjacent wedge blocks. 7

In testimony whereof we affix our signatures.

ERNST EMIL FROZETH. TERRY BLIXT.

